Isuzu 4JJ1 gearboxThe Isuzu 4JJ1 engine is a 3. 0L diesel engine commonly found in a range of Isuzu vehicles, and its gearbox is typically designed to fit the following models: Isuzu D Max (2006 Present) The 4JJ1 engine is standard in many D Max pickups, and the gearbox pairs directly with this engine. Isuzu MU X (2013 Present) The SUV variant of the D Max platform, the MU X, uses the same gearbox with the 4JJ1 engine. Isuzu N Series Trucks (NPR, NQR, NPS) Many light